Re: sub-tree filtering proposals

["Randy Presuhn" <randy_presuhn@mindspring.com>]

Hi -

> From: "Andy Bierman" <abierman@cisco.com>
> To: "Glenn Waters" <gww@nortelnetworks.com>
> Cc: "Frank Strauß" <strauss@ibr.cs.tu-bs.de>; <netconf@ops.ietf.org>
> Sent: Wednesday, June 09, 2004 10:23 AM
> Subject: RE: sub-tree filtering proposals
...
> >Is the mandatory to implement based on what Jeurgen proposed?
>
> this is the subtree filtering already in the draft and
> documented in my original email on this thread.  This
> is not partial Xpath

I'm sorry to hear this.  Implementation and validation
would be easier if the mandatory-to-implement subtree
filtering were a strict subset of Xpath.  Implementations
with full Xpath support wouldn't need to do anything
special.

...
> I agree with Phil.  We will have a lot of variance
> between minimal subset and full Xpath, and application
> writers will have difficulty managing this variance.
> If we had mandatory subtree plus optional full Xpath,
> there is less variance possible (just 2 choices: full
> subtree, full Xpath).
...

The variance is a problem only if we permit it to happen.
Even having two choices is not good, but if those happen
to be a well-specified strict subset and the whole enchilada,
I think it would be manageable.  Allowing various shades
of grey would not be.

Randy



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